Projecting device

Abstract

The invention relates to a projecting device, which comprises a control unit, a heat dissipating unit, a sensing module group and an airflow through-hole, wherein the sensing module group is used for detecting objects at the airflow through-hole; the control unit comprises a fixed resistor; the fixed resistor has a first temperature threshold, a second temperature threshold and a third temperature threshold; the third temperature threshold is larger than the second temperature threshold which is larger than the first temperature threshold; when detecting that an object exists at the airflow through-hole, the sensing module group sends a signal to the control unit, so as to enable the temperature of the fixed resistor to rise; when the temperature of the fixed resistor reaches the first temperature threshold, a first overheat preventing mechanism is stated; when the temperature of the fixed resistor reaches the second temperature threshold, a second overheat preventing mechanism is stated; when the temperature of the fixed resistor reaches the third temperature threshold, a third overheat preventing mechanism is stated. The projecting device disclosed by the invention has the advantages that when the internal temperature of the projecting device is over high, three stages of protective devices are triggered, so that the efficiency of an electronic circuit is steady and the life of a lamp bulb is prolonged.

Description

technical field [0001] The present invention relates to a projection device, and in particular to a device with a sensing module to detect whether the air inlet or outlet of the device is blocked by foreign objects to reduce the heat dissipation effect and activate the anti-overheating mechanism projection device. Background technique [0002] Whether it is for business or leisure purposes, the use of projectors is mainly to enlarge and project images on the screen. The main components of a traditional projector are a projection lens, an optical engine, and a light bulb. After the light emitted by the bulb passes through the optical engine, the image is projected onto the screen by the projection lens. When using a projector, the lamp must be continuously lit, and its luminous intensity must be sufficient to project a magnified image on the screen. As the bulb continues to glow, its heat will continue to increase. At the same time, when the light is emitted to the optica...

AI Technical Summary

Problems solved by technology

[0004] However, most of the heat sources inside the projector come from the lamp, followed by the power board, main board, etc. When the air inlet and outlet of the projector are blocked and the internal temperature is too high, the service life of the lamp will be reduced, and the electronic parts will not work normally or even burn out.

The traditional technology only detects the objects entering the air vent, and only increases the rotation speed of the heat dissipation unit, but does not pay attention to the temperature inside the projection device. But at this time, the temperature of the electronic components may have reached more than 100 degrees, and there is a problem. Stabilization phenomenon, the temperature of the lamp is higher, resulting in a reduction in the life of the lamp

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